Telephone-exchange system



G. H. HEYDT.

TELEPHONE EXCHANGE SYSTEM.

APPLxcATloN FILED MAR.2|.'19|7.

1,867,967. Patented Feb. 8, 1921.

3 SHEETS-SHEET l- /n van for: Gea/q@ H. Haya/f.

lolHGrou/ G. H. HEYDfT.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED MAILZI. i917.

Panted Feb. 8, 1921.

3 SHEETS-SHEET 2.

/n WM for: @ew/qv H. Heyd.

G. H. HEYDT.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED MAR. ZI, 19|?.

Patented Feb. 8, 1921.

3 suina-SHEET 3.

UNITED STATES PATENT OFFICE.

GEORGE n. HEYDT, or NEW YORK, N. Y., AssreNoR ro WESTERN ELECTRIC OOMrANY,f

INCORPORATED, OF NEW' YORK, N. Y., A CORPORATION' OF NEW YORK. -v

TELEPHONE-EXCHANGE SYSTEM.

specification of Letters Patent. Patented Feb. 3,- 1921,

Application filed March 21, 1917. Serial No. 156,321.

T 0 all whom it' may concern.'

Be it known that I, GEORGE H. HEYDT, a citizen of the United States, residing at New York, in the county of New York and State. of New York` have invented certain new and useful Improvements in Telephone- Exchange Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to automatic switches of the type used in automatic telephone exchange systems.

It is the object of this invention to provide an automatic switch of simple mechanical 'structure wherein a telephone line in each of a plurality of groups of lines is` selected and to any one of which connection is established. within a. certain period of time and at the termination of the group selecting movement.

Another object of the invention is to provide an arrangement in which any desired number of lines may be arrangedA in a group, without affecting the time of selec-v tion in any way.

A further object of the invention is to provide a switch arranged for use with a contact bank of the panel type which shall occupy relatively little space, and thereby allow the multiple terminals in the bank to be spaced more closely, thus allowing a greater number of switches to be mounted on a panel of a given length.

A feature of the invention is the use of a plurality of test relays which control the connection between the line terminating in the switch and the desired line terminating in contacts of the switch.

Another feature of the invention is the use of a plurality of iixed brush sets per switch, there being as many brush sets as there are lines in the group, and means for connecting a line to a desired one of said bru^h sets upon the termination of the group sele ting movement.

A further feature of the invention is a circuit arrangement such that the necessity of using side switches is eliminated.

It is thought that the invention will best be understood from the following detailed description, reference being had to the accompanying drawings.

In the drawings, Figure 1 shows the mechanical structure of a witch embodying the features of this invention and arranged for use as a line finder, together with the* and a portion of such selector switch tol i gether with the substation set of a called subscriber.

The mechanical features of the switch will first be briefly described, after which the mode of operation of the switch in con-y nection with suitable circuit arrangementsI will be set forth.

The switch shown in Fig. 1 consists of a brush shaft 9 arranged for longitudinal motion under the control of a ratchet 11 and a" lifting pawl 10, the pawl 10 being arranged to be operated by a stepping magnet 5. The contact bank 37 contains multiple terminal sets of lines to be selected, these terminal sets being arranged in groups. Secured to the brush shaft 9 are brush setsV 17, 17', etc., there being as many brush sets as there are lines in a group.

The grouping of the lines in the contact bank is such that the lines of a group are spaced apart a distance correspondingto the distance between the successive brush sets 17, 17, etc. As a result of this arrangement of the Contact bank there will be one of the brush sets resting upon each of the terminal sets of the rst group upon the completion of the first step of brush 4shaft 9. This grouping arrangement is indicated in Fig. 1. Associated with each brush setv is one of the test relays 22, 22, ctc., the ar rangement being such that when group selecting movement is completed, the test re! lays associated with all brush sets' resting.l on the terminals of selectable lines will be energized. Only one of the test relays can, however,- loclrup as will appear from the subsequent description, and the trunk conductors will then be extended to the desired line through armatures and back contacts of non-actuated test relays and the frontI contacts and armatures of the actuated test' relay to the brush set resting on the ter-A minals of the wanted line. Y

.es shown in Fig. 1, the switch is arranged for use as a line i'inder and the brush shaft 9 carri in addition a commutator brush 12' arranged to engage the segments of a commutator 14. The group selecting movement in this case being a hunting movement in search of a commutator segmentwhich is in a call-- ture is required the switches vcould be placed ver'y'close together and would resuit in the saving of space, due to the fact that the multiple terminal sets could be placed comparatively closely together, since A allowance for the rotary movement usual in step-bystep selector switches arranged for use in panel contact banks, would be unnecessary. 1t is also obvious that the groups may be made up of any desired number of lines` Without affecting the rate of selection, since the time required to effect selection and connection is only the time required for a test relay to pull up, regardless of the number of test relays. 1t' desired, the number of lines in a group might be increased by simply adding additional sections of contact banlr in a vertical direction, since it would be possible to build the brush shaft 9 in sections so that any number of lines per group might be served. d Y

The operation of the system is as follows. The subscriber whose substation is indicated at 1 may initiate a call by removing his receiver from the switchhoolr, whereupon line relay 2 will be energized in a circuit completed from grounded battery, left-hand vwinding of relay 2, outer left-hand armature and back Contact of cut-olf relay 3, the loop of the calling subscribers line, inner lefthand armature and back contact of cut-off relay` 3, right-hand winding of relay 2 to ground. Line relay 2 is energized and attracts its armatures, completing` a circuit from grounded battery, winding of relay 34 which is individual to the group of lines in which the calling subscribers line is located, left-hand armature and back contact of relay 4, left-hand armature and front contact of relay 2, to ground. Relay 34 is energized and locks up through itsleft-hand armature andfront contact. Relay 34 also completes a starting circuit from grounded battery, winding of stepping magnet 5, armature and back contact of stepping magnet 5, conductor 6, outer left-hand armature and back contact of change-over 'relay 7, conductor 8, winding of relay 4, outer right-hand armature and front contact of relay 34, to ground. Stepping magnet and slow-release relay 4 are energized in this circuit. Slow-release relay 4 attracts its armatures and maintains them attracted during the group-selecting movement of the switch, at its left-hand ar- Amature preventing the energization of any other group relays corresponding to relay 34, and at its right-hand armature holding open the release circuit of the finder switch.

Magnet 5, upon energization, Vadvances brush shaft 9 by means of pawl 10, which cooperates with the vertical ratchet 11 to advance the brush shaft 9 in a group-selecting movement. Magnet 5 interrupts its own circuit'and the brush shaft will be advanced until commutator brush 12 carriedthereby engages a conducting segment 13 of the commutator 14.' AThe segment 13is individual to the group containing the calling line and is characterized by the presence of ground potential, due to the energized condition of group relay 34, this ground potential extending from ground, inner armature and front contact of relay 34, conductor 15 to terminal 13. W hen brush -12 engages segment 13, a circuit is completed for changeover relay 7, extending from grounded battery, winding of relay 7 inner left-hand armature and baclr contact of relay 7, conductor 1G, brush 12, segment 13, conductor 15, inner rightshand armature and front contact of relay to ground. Relay 7, is energized and opens at its outer left-hand armature and back contact the driving circuit of magnet 5, which net then denergizes and brings'the brush shaft 9 to rest with the brush sets 17, 17 17, etc., in engagement respectively with the various lines of the group in which the call originated. Relay 7, upon energization, locked itself in its actuated condition over path from grounded battery, winding ofk relay 7, left-hand armature and front con-V tact of relay 7, and inner right-hand ar mature and back contact vof release magnet 18. Illhe circuits of release magnet 1S are shown in Fig. 2 and this magnet is indicated by dotted lines in Fig. 1 to show its actual position with respect to the switch mechanism. As shown in Fig. 1, in addition to. the circuits controlled by release magnet 18, a holding pawl 19 is `'controlled by such magnet. l

1f now we vassume that the terminals of. calling lines in a selected group are characterized by the presence of ground potential at the test terminal, and that non-calling Ylines or busy lines are characterized by the absence of such potential, the energization of relay 7 will complete a circuit from grounded battery, right-hand armature and front contact of'relay 7, armature and bach contact of relay 20. conductor 21, low resistance left-- hand windings of test relays 22, 22, 22', etc., innermost lefthand armatures and back contacts of such relays, to their associated test brushes 23, 23', 23, etc. {If we assuinethaf'j test brush 23 is restingy on the test terminal of the calling line, a circuit will'then be c inrelay 3 tovground, whereupon relays 22 and 3 will loe energized. Relay 22 operates to eX- tend the line conductors 26 ,and 27 of the calling line through terminals 28 and 29, and

brushes 3() and 31, and its outermost and middle left-hand armatures and front contacts to trunk conductors 32 and 33 leading to an idle selector switch. Relay 22 upon energization alsoelocls up through its high resistance right-hand Winding over a cir- -cuit yfrom grounded battery, outer righthand armature and back contact of release magnet 18, Winding relay 20,- conductor 35, right-hand armature and front cont-act of relay 22, through conductor 36 to ground. Relay 20 is energized in this circuit and at its armature opens the battery supply to con-V ductor 21 and thereby causes the release of any other test relays which might be energized due to the calling condition of the lines on Whose terminals their associated test brushes are resting, these relays being unable to lock up, since relay 22 at its right-hand armature opens the circuit by which these relays Would ordinarily be locked and which extends serially through the armatures' and back contacts oi unactuated Vrelays to the first relay to be actuated. It is to be noted that inasmuch as the test relays 22, 22', 22, etc., Will only respond to a callingy condition, only the lowermost of them Will lock up regardless of the number otl calls instituted in the particular group.

Cut-off relay 3 When energized locks up over a circuit from grounded battery, inner right-hand armature and front Contact of cut-off relay 3, and its right-hand Winding, to ground. The magnetic effect of the right and left-hand windings of relay 3 is differential, and since at this time no circuit exists through the left-hand winding of relay 3, this relay will remain energized during the conversation. Relay 3 at its inner righthand armature and back contact breaks the test circuit over which the test` relay 22 Was originally energized and renders this line nen-selectable to other limiting linders. Cutoi'f relay 3 causes the denergization of relay 2, and the resultant denergization of relay 34.

t is to'be observed that relay 7 upon attracting its outer lett-hand armature extends the starter Wire to the next idle finder in a manner Well-known in the art. When the succeeding line finder switch is being operated in response to a call from a preceding group by means of the in-and-outstarter Wires shown in Fig. 2, the starter Wire cannot be interrupted at the switch shown in 2, due to the fact that the slow-release relay 4 is maintained energized during the operation of such' line finder.` The energized condition of relay 4 prevents the energization of group relay 34 which would result inthe breaking of the starterwire circuit at the outer right-hand-armature of relay 34. Relay 4 at its right-hand armature also holds openthe circuit o'f release magnet 18 so that y theswitch cannot be .restored `While-another finder is being set, for il. the switch shown 1n Fig. 2 should restore, the changeover relay 7 Would denergize and break the starterV Wire circuit at its outer left-hand armature and front contact.

As soon as the calling line is extended to the selector shown in Fig. 3, lineY relay 39 is energized over a circuit Jfrom grounded battery, left-hand winding of relay 39, inner right-hand armature and back contact of changeover relay y40, trunk conductor 33, outermostI leftha`nd armature and front contact of relay 22, brush 30, terminal 29, conductor 27, substation apparatus of the calling subscriber, sender 38, conductor 2G, tei'- minal 28, brush'31, middle leftfhand armature and Jfront contact of relay 22, conductor 32, outer right-hand armature and back contact of relay 40, right-hand Winding of relay 39, to ground. The energization of relay causes the energization ot' sloiverelease relay 41 in a circuit from grounded battery, winding of relay 41, armature and front contact of relay 39 to ground. Relay 41, upon energization, at its left-handV armature removes ground from the release conductor 61, which Would otherwise cause the release of the finder switch. Ii the switch were to be used. as a second selector, the operation of relay 41 would remove the test condition from the test conductor to prevent this selector from being seized by a lirst selector.

The calling subscriber may noW operate his dial to send the first series of selective impulses. Upon the denergization of relay 39, slow-release relay 42 is energized over a circuit from grounded battery, Winding of relay 42, right-hand armaturey and front contact of relay 41, armature and back contact of relay 39, to ground. Relays 41 and 42 remain energized throughout this series of impulses. Upon each denergization of relay 39, stepping magnet 43 is energized over a circuit from grounded battery, winding of magnet 43, right-hand armature and front contact of relay 41, armature and back contact of relay 39, to ground. The selector brush shaft 44 carrying brush sets 45, 45', etc., is advanced one step upon each energization of magnet 43.

Upon theV termination of this. set of impulses relay 39 remains energized for a relatively long period of time, causing the deenergization of relay 42. Changeover relay 40 is then energized over a circuit 'from grounded battery, Winding of relay 40, armature and back contact of relay 42, and

contact l46 to ground. lContact 46 was closed upon the first step of brush shaft 44.

If now we assume that the idle condition of trunks leading to succeeding switches is characterized by the presence of ground on their test terminals, and that busy lines are characterized by the absence of such potential, multiple circuits will be completed for the test relays 47, 47,etc., associated with brush sets resting on the 'terminalsof idle lines. The circuit Vextends from grounded battery, outer left-hand armature and front contact of relay 40, armature and back contact of relay 48, conductor 49, the low resistanceoperating windings of the test relays to their associated test brushes, to ground. These relays will be energized and in the case assumed, since relay 47 was energized, it will lock up and prevent the locking up of the other test relays which were actuated.

front contacts of relay 40, the outermost and middle right-hand armatures and front conta-cts of relay 47, and brushes 52. and 53, to a succeeding switch. A succeeding switch is indicated by brushes 54 and 55 and terminals 56 and 57, and may be a connector` switch of any desired type. After connection has been established by means of the connector switch the parties may converse.

c Upon the termination of the conversation, ground will be applied to test terminal 58, whereupon a circuit for release magnet 50 will be completed from grounded battery, winding of magnet 50, innermost right-hand armature and front contact of relay 47 testy brush 59, test terminal 58, to ground. ince only one test relay is in an actuated condition, release magnet 50 cannot be affected by the busy or idle condition of the other lines in the group, its circuitv being controlled at` a front contact of such test relay. Magnet 50 upon energization completes a locking circuit for itself through its right-hand armature and :front contact and off-normal Contact 60, which was closed upon the Vfirst step of brushshaft 44. Magnet 50 atits inner left-hand armature opens the locking circuit ot relay 47 in which circuit relay 48 was included, and these relays de'energized.

At the outer left-hand armature and front" contact of magnet 5() ground is applied to release conductor 61, whereupon finder release magnet 18 is energized over a circuit The calling line has nowv been eX-` tended to an idle trunk in the selected group by way of the right-hand armatures and from 'grounded battery, -windigrof magnet 18, conductor 62, right-hand armature and' back contact of'relay 4, conductor 6l, inner lett-hand armature and rfront contact of' relay 40, outer left-hand armature and front contact of magnet50, to ground.

When brush shaft 44 reaches its normal position contacts 46 and 60 are opened, causing the denergization of changeover relay 4() and release magnet 50 respectively. The apparatus shown in Fig. 3 has now been fully restored.v Y

Finder release magnet 18 upon energiza` tion locked up through its left-hand armature and frontl contact and oi"-normal contact 63, which was closed upon the first step of the finder switch. At its outer rightliand armature magnet 18 opens the locking circuitrof test relay 22, in which circuit relay 20 was included, and these relays are deenergized. Upon the energization otmagnet 18 a circuit was also completed from grounded battery, lett-handV winding of cutoii relay, outer right-hand armature and front contact of cut-oft' relay 3, conductor 25, terminal 24, brush 23, Vinnermost lefthand armature and `front contact oit' relay 22, conductor 64, inner right-hand armature and front contact of magnet18 to ground. Since both windings of relay 8 are now energized and since they are diiierential in eiect, cut-off relay 3 will denergize. Nhen brush shaft 9 reaches its 'normal position, off-normal contact 63 will be opened and the release magnet will be denergized. All parts of they apparatus have now been restored to their normal positions.

Viliat is claimed is:

l. In an automatic telephone exchange system, a contact bank, telephone lines terminating therein Aand arranged in groups,

an. automatic switch including a movable brush shaft inoperative relation to said contact bank, a plurality of test relays, means to advance said brush shaft in a group se# lecting movement, and means to accomplish the selection of a desired line by means of said relays.

2. In an automatic telephone exchangeV system, a contact bank, telephone lines terminating therein and arranged in groups, an' automatic switch includinga movable brush shaft in operative relation to said contact In an automatic telephone exchangeV system, a contactbank, telephone lines terminating therein and arranged in groups, means to change the electrical condition ot rio sor

a contact set to render a line selectable, an automatic switch including a movable brush shaft in operative relation to said contact bank, means to advance said brush shaft in a group selecting movement, means operable upon the termination of said group selecting movement to cause said switch to select and establish connection to a line whose contact set is in a selectable electrical condition, and means to effect said line selection within the same period of time regard- -less of the number of lines of the group which are in a non-selectable electrical condition.

4, In an automatic telephone exchange system, a contact bank, outgoing lines terminating therein and arranged in groups, a selector switch including a movable brush shaft arranged in operative relation to said contact bank, a plurality of brushes carried by said shaft, and in fixed relation thereto, a calling subscribers line, a connecting circuit terminating at said selector switch, means to extend said calling line to said connecting circuit, and means to operate said switch to accomplish both group selection and line selection as a result of a single movement of said brush shaft and brushes, said movement being directively controlled by said calling subscriber.

5. Iii an automatic telephone exchange system, a terminal bank, Contact sets arranged therein in groups, an automatic switch including a movable brush shaft in operative relation to said contact bank, a plurality of brushes carried by saidv shaft and in fixed relation thereto, a line, a plurality of test relays, means to advance said brush shaft in a-group selecting movement, and means to extend said line to a desired contact set by a single movement of said shaft and brushes through contacts controlled by said relays. y

`6. In an automatic telephone exchange system, an incoming line, a group of outgoing lines, a plurality of relays, means to associate one of said relays with each of said lines, means to actuate such ones of said relays as are associated with lines in a selectable condition, means to allow one'only of said relays to remain energized, and circuits controlled at back contacts of nonactuated relays and at front contacts of an actuated relay to establish connection between said incoming line and a desired one of said outgoing lines.

7. In an automatic switch for use in telephone exchange systems, an automaticv switch, a contact bank, telephone lines ter- ...manybriish sets @there-are lines Persiani,

a test relay associated with the testA brush vof each of said brush sets, a line incoming to said automatic switch, mea-ns to position said brush sets simultaneously on the various contact sets of the lines of a desired group,..-y

and means to extend said incoming line tol a desired contact set through contacts controlled by said test relays.

8. In a telephone exchange system, a plurality of groups of telephone lines, a selectively operated switching device including a movable shaft and a plurality of brushes in fixed relation thereto, meansl for operating said device for selecting a line in each group at the termination of said movement,

and means operated thereupon for causing said device to seize a certain one of said lines.

9. In a telephone exchange system, a plurality of groups of telephone lines, a selecf tively operated switching device having a single longitudinal movement, said switching device including a movable shaft and a plurality of brushes in fixed relation to said shaft, means for operating said device Y for selecting a line in each group at the termination of said movement, and means operated thereupon for causing said device to seize a certain one of said lines.

10. In a telephone exchange system, a plu-y1 ing electrical. connections through one set of said brushes only.

11. In a telephone exchange system, a plurality of groups of telephone lines, a selectively operated switching device including a movable shaft and a plurality of brushes and in xed relation thereto, means for limparting a single movement to said'shaft'and brushes for selecting a line in each group, and means actuated as a result of such single movement for establishing an electrical connection through one only of said sets of brushes. 1

12. In a telephone exchange system, a plurality of groupsoftelephone lines, a brush shaft, a plurality of sets of brushes ixedly secured to said shaft and disposed in vertical alinement, means for operating' said shaft and brushes for selecting a line in each group of lines, and means operated thereupon for establishing electrical connections through one only of said sets of brushes.

13. In a telephone exchange system, a plurality of groups of telephone lines, a selectively operated switching device, including a movable shaft and a plurality of brushesin l:fixed relationthereto, means for operating said device for selecting a line in each group, and means operated' thereupon to cause said ldevice to seize a certain one of said lines in Y tact bank, telephone lines terminating theretions to a line by its associa-ted brush set, vvand in and arranged in groups, a brush shaft having a single movement associated` with said group of lines, a plurality of brushes carried by said shaft, means for moving said shaft to cause said brushes to select a line in each group, and means operable upon the termination of the group selection to establish electric connections'through one only of said sets of brushes in accordance with electrical characteristics of said lines.

l5. In a telephone exchange system, a plurality of groups of telephone lines, a selectively operated switching device including a movable snatt anda plurality of brushes in fixed relation thereto, means for operating said device for selecting a line in each group, a plurality7 of relays, and means for locking up one ofsaid relays at the termination of operation of the last named means whereby said switching device will seize a certain one of said lines. 30Y

16. In a telephone exchange system, a plurality of groups of telephone lines, a movable brush shaft, a brush set -for each group of lines carried by said shaft, means for operating said Vshaft to cause said sets of brushes to select a line in each group, a test relay associated with each brush set and energized whenthe test terminal of the line in the particular group engaged by said brush set denotes a calling condition, and means for locking only one of said test relays whereby its brush set will seize a certain one of said lines.

W. In a telephone exchange system, a plurality of groups of telephone lines, a plurality of brush sets associated therewith, a movable carrier, said brush sets being fixedly secured thereto, means to operate said carrier to cause said brush sets to select a line in each group, a plurality of electromagnetic means,

one for each of said brush sets, and means for operating any one of said electromagnetic means for causing the establishment of electrical connections through one only of said brush sets. 5 l

18. In a telephone exchange system, a plurality of groups of telephone lines, a plurality of brush sets associated therewith, a movable carrier, said brush sets being ixedly secured thereto and-means to operate said carrier to cause said brush sets to select a line'in each group, a plurality ot' electromagnetic means, one for each of said brush sets, means for operating any one of saidelectromagnetic means for completing electrical connecmeans operative-upon the actuation of one of said electromagnetic means for preventing the operation of another electromagnetic means;

19. In a telephone exchange system, a plupletion ot electrical circuits to a line by an associated brush set. ,y

20. In a telephone exchange system, a plurality of groups of telephone lines, a plurality of brushes associated therewith, means for operating said brushes to cause the same to select aline in each group, a plurality of relays, one for each oi' said brushes, means for operating any one of said relays for causing the seizure of a line by its associated brush, and means operative upon the actuation of one of said relays for preventing the operationorn another relay.

21. In a telephone exchange system, a plurality ofA groups of telephone lines, a plurality of brushes associated therewith, means for operating said brushes to cause the same to select a line in each group, a plurality of means, one Vfor each of Said brushes, for seizing said lines, means for operating any one of said means for causing the seizure of only one of said lines, 'and means operative upon the actuation of one of said pluralityy of means for preventing the operation of any other thereof.

22. In a telephone exchange system, a plurality of groups of telephone lines, a plurality of brushes associated therewith, means for operating said brushes tofcause they same to select a line in each group, a plurality of electromagnetic means, one for each of said brushes, means for simultaneously actuating a plurality of said electromagnetic means, and means for rendering effective the actuation of only one.

Y 23. In a telephone exchange system, a plurality of telephone lines, a plurality of brushes associated therewith, means for causing said brushes to select certain of said lines, a plurality of relays, one for each brush, means for simultaneously actuating Va plurality of said relayspand means forv tion of one of said plurality of means for preventing the operation of any other thereof.

25. In a telephone exchange system, a plurality of telephone lines, a plurality of brushes associated therewith, means for causing said brushes to select certain of said lines, a series of relays, one for each of said brushes, means for simultaneously actuating a plurality of said relays, and means for rendering effective the actuation of only the first of said plurality of relays.

26. In a telephone exchange system, a plurality of groups of telephone lines, a switching device including a plurality of line selecting means in fixed relation to one another, means for operating said line selecting means to cause the same to select a line in each group, a plurality of electromagnetic means, one :tor each of said line selecting means, and means for operating any one of said electromagnetic means for establishing electrical connections to a line by an associated line selecting means.

27.. In a telephone exchange system, a plurality of groups of telephone lines, switching means, means for operating said switching means for selecting a certain line in any group within a certain period of time, means for operating said switching means for selecting a certain other line in any group within a certain other period of time, means for seizing a certain-one of said lines Within a certain period oi time, and means for seizing a certain other line within the last men- Jtioned certain period of time.

28. In a telephone exchange system, a plurality of groups of telephone lines, switching means, means for operating said switching means for selecting a certain line in any group within a certain period of time, means for operating said switching means for selecting a certain other line in any group within a certain other period of time, means for seizing a line of a certain group within a certain period of time, and means for seizing a line of a certain other group within the last mentioned certain period of time.

In witness whereof I hereunto subscribe my name this 19th day of lMarch, A. D.,

GEORGE H. HEYDT. 

